P1631

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

This test checks for mismatched passwords between the VTD control module and PCM. Whenever the VTD control module or PCM are replaced, a theft learn procedure must be followed in order for the new password to be learned.

CONDITIONS FOR SETTING THE DTC

^ The vehicle Anti-Theft system is enabled.

^ The fuel disable is set.

^ An incorrect fuel continue password has been received.

ACTION TAKEN WHEN THE DTC SETS

^ The vehicle will not start.

^ The Malfunction Indicator Lamp (MIL) will not illuminate.

CONDITIONS FOR CLEARING THE DTC

^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other emission related failure.

^ PCM battery voltage is interrupted.

^ Using a scan tool.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the diagnostic table.

3. The 11 minute and 30 second time criteria, are a minimum required amount of time. The time limit can exceed this limit, without interfering with the Auto Learn Procedure. A Scan Tool can be used (VTD Auto Learn Timer equals Inactive) to determine when the 11 minutes has expired.

8. If DTC P1631 is set, indicates that the procedure was not followed correctly. The Re-learn procedure will have to be re-performed.